Adding : python -c 'help("modules") to the other two suggestions:
#!/usr/bin/env python
import commands, pkgutil, re, sys
print('sys.modules.items()...')
print('\n'.join(sorted([re.findall("from '(.*)'",str(v))[0] for k,v in
sys.modules.items() if str(v).find('from')>-1])))
print('\npkgutil.it
Type: python -V
(That was a capitol V) What version of python is running?
Type: python3 -V
(That was a capitol V) What version of python is running?
Type: python -c 'import pygame'
What is the exact error message?
Type: python
Your prompt should change to something like: >>>
Type: import pygame
At the Terminal prompt type: python -c "help('modules')"
If Pygame is not somewhere in the output then Pygame is not yet installed.
If it is not installed then type: pip install --upgrade pygame
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